Here is an interesting piece of concept artwork from the She-Ra series featuring Sorrowful; the cowardly dragon that first appeared in the season one episode "The Laughing Dragon". You can see that even at this early stage the fundamental look of the character had already been established. The most notable difference is that the character originally had droopy ears to emphasize his sad demeanor. I for one think that the ears should have remained on the final character model.
(click on the image to see it at full-size)